Microbial responses to inorganic nutrient amendment overridden by warming: Consequences on soil carbon stability
Microbial responses to inorganic nutrient amendment overridden by warming: Consequences on soil carbon stability
复制标题
DOI：
10.1111/1462-2920.14239
复制
发表时间：
2018-07
影响因子：
5.1
通讯作者：
Mengmeng Wang;Junjun Ding;Bo Sun;Junyu Zhang;K. Wyckoff;Haowei Yue;Mengxin Zhao;Yuting Liang;Xiaoyue Wang;Chongqing Wen;Jizhong Zhou;Yunfeng Yang
中科院分区：
文献类型：
--
作者：
Mengmeng Wang;Junjun Ding;Bo Sun;Junyu Zhang;K. Wyckoff;Haowei Yue;Mengxin Zhao;Yuting Liang;Xiaoyue Wang;Chongqing Wen;Jizhong Zhou;Yunfeng Yang
人类活动引起的富营养化和气候变暖正在全球同步发生，并共同影响土壤碳的稳定性。因此，研究它们是否以及如何相互影响土壤微生物群落这一主要的土壤碳驱动因素是非常有意义的。研究结果表明，冷温带(N)向暖温带(C)和亚热带(S)转移Mollisol土壤所模拟的气候变暖导致土壤有机质（SOM）减少6% ~ 12%。相反，氮、磷和钾的改良使N位点的植物生物量增加了97%，SOM增加了6%，从而刺激了富营养化类群，但减少了贫营养化类群的相对丰度。然而，微生物对养分改良的响应被土壤转移所覆盖，养分改良在C位点几乎没有影响，但在S位点，从担子菌门衍生的难降解碳真菌菌丝菌和微孢子菌类群增加了4-17倍，难降解碳基因增加了23%-40%，这表明可能存在启动效应。结果表明，尽管植物生物量增加了108%，但养分改良并未增加S点的SOM。总的来说，我们证明了土壤向温暖地区的转移超越了微生物对养分修正的反应，削弱了土壤的碳固存。
Eutrophication and climate warming, induced by anthropogenic activities, are simultaneously occurring worldwide and jointly affecting soil carbon stability. Therefore, it is of great interest to examine whether and how they interactively affect soil microbial community, a major soil carbon driver. Here, we showed that climate warming, simulated by southward transferring Mollisol soil in agricultural ecosystems from the cold temperate climate zone (N) to warm temperate climate (C) and subtropical climate zone (S), decreased soil organic matter (SOM) by 6%-12%. In contrast, amendment with nitrogen, phosphorus and potassium enhanced plant biomass by 97% and SOM by 6% at the N site, thus stimulating copiotrophic taxa but reducing oligotrophic taxa in relative abundance. However, microbial responses to nutrient amendment were overridden by soil transfer in that nutrient amendment had little effect at the C site but increased recalcitrant carbon-degrading fungal Agaricomycetes and Microbotryomycetes taxa derived from Basidiomycota by 4-17 folds and recalcitrant carbon-degrading genes by 23%-40% at the S site, implying a possible priming effect. Consequently, SOM at the S site was not increased by nutrient amendment despite increased plant biomass by 108%. Collectively, we demonstrate that soil transfer to warmer regions overrides microbial responses to nutrient amendment and weakens soil carbon sequestration.